<!DOCTYPE html>
<html>
<head>
	<title>浮动</title>
	<style type="text/css">
		.content {
			width: 100%;
			height: 200px;
		}
		.left {
			width: 200px;
			height: 100%;
			float: left;
			background: red;
		}
		.right {
			height: 100%;
			overflow: hidden;
			background-color: blue;
		}
	</style>
</head>
<body>
	<div class="content">
		<div class="left"></div>
		<div class="right"></div>
	</div>
	<script type="text/javascript">
		var a = { k1: 'v1' };
		var b = a;
		var a = a = { k2: 'k2'};
		console.log(a);
		console.log(b); 
	</script>
</body>
</html>